package com.augmentum.oes.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Filter to change Character coding
 * 
 * @author Kerry.zou
 *
 */
public class CharacterFilter implements Filter {
    String coding = null;

    @Override
    public void destroy() {
        coding = null;
    }

    @Override
    public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException,
            ServletException {
        HttpServletRequest request = (HttpServletRequest) arg0;
        HttpServletResponse response = (HttpServletResponse) arg1;

        if (coding != null) {
            request.setCharacterEncoding(coding);
            response.setContentType("charset=" + coding);
        }
        arg2.doFilter(arg0, arg1);
    }

    @Override
    public void init(FilterConfig arg0) throws ServletException {
        coding = arg0.getInitParameter("coding");
    }

}
